A B.C.-based criminal defence lawyer says “chances are high” that a roadside screening device that the federal government is set to approve to weed out stoned drivers will be vulnerable to a court challenge.

It’s called Abbott SoToxa, and can detect THC among other drugs.

“The government has abstained from officially approving the device until the 30-day consultation period following its announcing has expired,” noted lawyer Sarah Leamon, counting down from the April 20 announcement. “But now that it’s done, chances are high that the SoToxa will be approved some time this week.”

“The problem with all this technology, at the end of the day, is that it just cannot detect impairment,” she told the Now-Leader. “So it simply detects presence of a drug in the oral fluid, it does not even detect the drug in the blood stream and it says nothing about impairment.”

Asked why the feds would bother with it, then, Leamon said the approach the government has always taken to cannabis and driving, following its legalization, “has been to mirror it with the alcohol-impaired driving.

“With alcohol-impaired driving we have those per-se limits where you could be charged with impaired driving, you could also be charged with driving with a blood alcohol concentration over 80 milligrams per cent,” she noted.

“They’re trying to mirror that exact same thing for THC but the problem is that alcohol and THC are just completely different animals. I think they’re just not approaching it using an informed common-sense approach, for lack of a better term.”

RCMP Lower Mainland District spokesperson Sgt. Janelle Shoihet told Black Press Media that “any decisions about devices being used would be co-ordinated by our national office and not unique to the BC RCMP.”